Mold for building blocks



April 22", 1924.

0. A. PEDERSEN MOLD FOR BUILDING BLOCKS Filed Aug. 22. 1921 fiq. l

IN VENTOR P A TTORA'EY Patented Apnz 1924.

warren srairss OSCAR A. rnnnnsnn, or new YORK, N. Y.

Mom) FOR BUILDING BLOCKS.

Application filed August 22, 1921. Serial No; 494,083.

To all whom it may concern:

Be it known that I, OSCAR A. PEDERSEN, a citizen of the United States,and a resident of the city of New York, in the county of Bronx and Stateof New York, have invented certain new and useful Improvements in Moldsfor Building Blocks, of which the following, is a full, clear, and exactdescription.

Among the principal objects which the present invention has in view are:to construct a hollow concrete block for use in building constructionwhich, while being light in weight will be capable of sustainingconsiderable weight; to provide an apparatus for the formation of theblocks, through the medium of which ,the blocks can be made quickly andwith a minimum amount of labor; to provide a mold which can be quicklyknocked down for storing, and which, when in use, can be adjusted toform various sized blocks.

Drawings.

Figure 1 is a sectional plan view taken on the line 11 of Figure 2showing the block in the course of construction together with theadjustable mold in which it is formed.

Figure 2 is a sectional elevation taken on the line 22 of Figure 1showing the method of adjusting the mold to form various sized blocksand also the means used to tamp the concrete in order to make the samesolid and force the moisture therein to the exterior.

Description.

Referring to the drawings, 10 designates in its entirety a block formingmold comprising a base 11, to one edge of which is hinged as at 12, awall forming member 13 adapted to extend the length of the mold. To theopposite edge 14 of the base there is fixed a supporting member 15,through which there is adapted to pass partially threaded rods 16carrying at their ends a wall forming member 17 extending the length ofthe mold. Nuts 18 on the inner and outer sides of the member 15 allow ofadjusting the rods to move the member 17 to form a narrow or wide block.

It is desirable that air passages be formed in the blocks in order todissipate any moisture coming through that portion of the block whichwill be exposed to the elements. Metallic inserts are provided, whichwhen withdrawn leave an air passage, said inserts comprising a centermember 19, the

walls of which are angularly disposed and are held in fixed relation bythe channel members 20. The end inserts 21 comprise angularly disposedwalls 22, said walls being also connected by channel members 20,

and adapted to slightly overlie the walls of the center member 19 inorder to prevent the concrete from gaining access to the space betweenthe channel members. The outer ends of the end inserts 21 abut wall.members 22 which are hinged to the supporting member 15 as at 23. Tierods 24'may be employed to connect the opposite sides of the block andmay be disposed at the outer edge of the block or at the center,provisionbeing made in the latter case for the withdrawal of the insertsby providing slots therein. The ends of the rods are bent to grip theconcrete.

A footing member 25 may be used to form the block upon, so that thesame, may be readily moved out of the mold.

An upright 26 extending from the support 15 has pivoted at its upper endan operating lever 27 which is suitably counterbalanced as at 28. Thelever has pivoted thereto and overlying the mold two tampers 29, whichare held in spaced relation by the members 30, one of which is suitablypivoted as at 31 to the upright 26.

It is to be understood that any number of tampers might be used and thatthey could be adjustable relatively.

In operation, when the block has been finished and is partially dry, thewall member 13 is swung down, and the projecting ends 32 thereondisengage the end members 22*, and they in turn are swung outwardlycarrying with them the end inserts 21. The center insert 19 is thendrawn out of the block, the block is removed and the mold again madeready for concrete.

A suitable latch 38 may be provided 011 the member 13 for maintaining itin closed positions.

Claims.

1. A block forming mold comprising front, rear and end walls, said endwalls being hingedly mounted for horizontal swinging movements into andout of operative position and said rear wall being p0sitioned betweenthe end walls and adjustable towards and away from the front wall,

and means for forming an opening in a block being molded said meansincluding sections connected with said end walls and movable therewithoutwardly of a formed block when the end walls are swung to theirinoperative positions.

2. A block forming mold comprising a bottom, front, rear and end walls,the end walls being hingedly mounted for swinging outwardly to aninoperative position, and inserts for forming air passages in a blockformed in the mold, said inserts including an intermediate inserttapered towards its ends, and end inserts each having spaced wallelements secured at their ends to one of said end walls and extendingfrom the end wall in converging relation and adapted for overlappingengagement with the intermediate insert the end inserts being moved outof a formed block when the end walls are swung to an inoperativeposition.

OSCAR A. PEDERSEN.

